Wraps SDL_RenderReadPixels which makes a dsdl2.Surface from the renderer's entire target
requested dsdl2.PixelFormat of the returned dsdl2.Surface
dsdl2.Surface copy of the renderer's entire target
dsdl2.SDLException if pixels failed to be read
See Implementation
Wraps SDL_RenderReadPixels which makes a dsdl2.Surface from the renderer's entire target